refs: move doc to refs.h

[thirdparty/git.git] / refs.h

diff --git a/refs.h b/refs.h
index 730d05ad91a6ac8961c58d599942a5721960d7d7..545029c6d8050a173a1486cdaffb8f33c51ae93e 100644 (file)
--- a/refs.h
+++ b/refs.h
@@ -310,19 +310,35 @@ int refs_for_each_branch_ref(struct ref_store *refs,
 int refs_for_each_remote_ref(struct ref_store *refs,
                             each_ref_fn fn, void *cb_data);
 
+/* just iterates the head ref. */
 int head_ref(each_ref_fn fn, void *cb_data);
+
+/* iterates all refs. */
 int for_each_ref(each_ref_fn fn, void *cb_data);
+
+/**
+ * iterates all refs which have a defined prefix and strips that prefix from
+ * the passed variable refname.
+ */
 int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data);
+
 int refs_for_each_fullref_in(struct ref_store *refs, const char *prefix,
                             each_ref_fn fn, void *cb_data,
                             unsigned int broken);
 int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data,
                        unsigned int broken);
+
+/**
+ * iterate refs from the respective area.
+ */
 int for_each_tag_ref(each_ref_fn fn, void *cb_data);
 int for_each_branch_ref(each_ref_fn fn, void *cb_data);
 int for_each_remote_ref(each_ref_fn fn, void *cb_data);
 int for_each_replace_ref(struct repository *r, each_repo_ref_fn fn, void *cb_data);
+
+/* iterates all refs that match the specified glob pattern. */
 int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data);
+
 int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
                         const char *prefix, void *cb_data);
 
@@ -791,6 +807,41 @@ int reflog_expire(const char *refname, const struct object_id *oid,
 int ref_storage_backend_exists(const char *name);
 
 struct ref_store *get_main_ref_store(struct repository *r);
+
+/**
+ * Submodules
+ * ----------
+ *
+ * If you want to iterate the refs of a submodule you first need to add the
+ * submodules object database. You can do this by a code-snippet like
+ * this:
+ *
+ *     const char *path = "path/to/submodule"
+ *     if (add_submodule_odb(path))
+ *             die("Error submodule '%s' not populated.", path);
+ *
+ * `add_submodule_odb()` will return zero on success. If you
+ * do not do this you will get an error for each ref that it does not point
+ * to a valid object.
+ *
+ * Note: As a side-effect of this you cannot safely assume that all
+ * objects you lookup are available in superproject. All submodule objects
+ * will be available the same way as the superprojects objects.
+ *
+ * Example:
+ * --------
+ *
+ * ----
+ * static int handle_remote_ref(const char *refname,
+ *             const unsigned char *sha1, int flags, void *cb_data)
+ * {
+ *     struct strbuf *output = cb_data;
+ *     strbuf_addf(output, "%s\n", refname);
+ *     return 0;
+ * }
+ *
+ */
+
 /*
  * Return the ref_store instance for the specified submodule. For the
  * main repository, use submodule==NULL; such a call cannot fail. For